Light micrograph of lung tissue

Light micrograph of lung tissue

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Credit: ASTRID & HANNS-FRIEDER MICHLER/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of a secion of lung tissue showing numerous alveoli (small air spaces) and alveolar ducts (larger spaces). Air enters the lungs via the bronchi, which divide repeatedly to form airways of ever-decreasing diameter. The terminal branches of this respiratory tree, the alveolar ducts, open into the blind-ended alveoli, which are the sites of gaseous exchange. The walls of the alveoli contain a fine network of tiny capillaries, carrying deoxygenated blood from the right side of the heart. The blood absorbs oxygen & releases carbon dioxide through the thin alveolar walls. Magnification: x25 at 6x7cm size.

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Keywords: alveolus, anatomy, healthy, human body, lung, lungs, respiratory system

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